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Modeling of microstructure evolution and properties for Ni-based superalloys
1. Modeling of microstructure evolution and properties for Ni-based superalloys
2. Content
• Brief overview of Ni-based supealloys• Computational model development
• Microstructure modeling during specified heat treatments
• Calculation of mechanical properties based on predicted
microstructure
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3. Brief overview of Ni-based supealloys
34. Composition of superalloys
• Ni – base• Up to 40 wt % of a combination of five to
ten other elements
• Primary phases – γ (nickel-based solid solution) and γ’ (Ni3Al)
An exceptional combination of high-temperature strength,
toughness, and resistance to degradation in corrosive or
oxidizing environments
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5. Strengthening mechanisms
• γ-phase solid-solution strengthening by refractory elements• Precipitation strengthening by γ’-phase
• Grain size (directional solidifying)
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6. Detrimental phases – topologically closed-packed phases
• Orthorhombic P phase, the tetragonal σ phase, the rhombohedralR, and rhombohedral μ phases
• TCP-phases deplete strengthening elements and/or serve as crackinitiation site
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7. Computational model development
78. Theoretical models and numerical method
• TC-PRISMA adopts Kampmann-Wagner numerical method,based on the theory from Langer-Schwartz
Nucleation
Growth/dissolution
Coarsening
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